definition l carnitine L-Carnitine helps the body turn fat into energy. If your plan is to use this supplement to optimize energy during your workout, it's best to take it prior to working out. . . . # Carnitine: the claims and why

Brager MA, Patterson MJ, Connolly JF, Nevo Z

Because IM injections send B12 directly into muscle, the vitamin peaks in blood within about an hour, ensuring tissues get what they need

52 Atrial fibrillation (AF) is not only a complication of various cardiovascular diseases but also significantly increases the risk of cardiovascular events

However, there is good evidence that, although folic acid binds avidly to this receptor in the choroid plexus, it does not cross the opposite, apical membrane to enter the cerebrospinal fluid (CSF) (78)

Int J Mol Sci, 2020;21(3)

If you are experiencing any of the above, a Vitamin B12 shot could provide you with some relief from the symptoms, but you should still consult your GP to rule out any other causes